A hierarchical ZSM-22/PHTS composite material and its hydro-isomerization performance in hydro-upgrading of gasoline

Abstract

CoMo series catalysts based on ZSM-22/PHTS (ZP) composite materials with different SiO₂/Al₂O₃ molar ratios were prepared via the impregnation method. The properties of the ZP material and the corresponding catalysts were analyzed by a series of characterization methods. The hydro-upgrading performance of the catalysts was evaluated on a fixed-bed reactor under the operation conditions of 270 °C, 200 ml ml⁻¹, 2.0 h⁻¹, and 2.0 MPa. The catalyst with the ZP material as the support additive exhibited better activities than the reference CoMo-based Al₂O₃ and ZSM-22 catalysts. The CoMo/ZPA120 catalyst presented a good balance between hydrodesulfurization (HDS) activity (95.2%) and lower loss of research octane number (ΔRON = −1.1). The results suggested that the molybdenum–support interaction, the dispersion, and stacking states of MoS₂ slabs were the key factors in forming sufficient type II CoMoS active phases for better catalytic activity.